- Is a 38 gene panel that includes assessment of non-coding variants
Is ideal for patients who fulfill clinical diagnostic criteria for hypertrophic cardiomyopathy (HCM) or have significant LVH without a history of high blood pressure or aortic stenosis .
Number of genes38
CPT codesSEQ 81439
The Blueprint Genetics Hypertrophic Cardiomyopathy (HCM) Panel (test code CA1901):
- Is a 38 gene panel that includes assessment of selected non-coding disease-causing variants
- Is available as PLUS analysis (sequencing analysis and deletion/duplication analysis), sequencing analysis only or deletion/duplication analysis only
Commonly used ICD-10 code(s) when ordering the Hypertrophic Cardiomyopathy (HCM) Panel
|I42.2||Hypertrophic cardiomyopathy (HCM)|
- EDTA blood, min. 1 ml
- Purified DNA, min. 3μg
- Saliva (Oragene DNA OG-500 kit)
Label the sample tube with your patient’s name, date of birth and the date of sample collection.
Note that we do not accept DNA samples isolated from formalin-fixed paraffin-embedded (FFPE) tissue.
Hypertrophic cardiomyopathy (HCM) is one of the most common human monogenic disorders with prevalence estimates of 1:500, predicting approximately 600,000 persons with HCM in the US alone. It is also the most common cause for sudden cardiac death among young adults. HCM is generally defined by the development of unexplained left ventricular hypertrophy (LVH) and commonly caused by mutations in cardiac sarcomere genes. In HCM, LVH occurs in a non-dilated ventricle in the absence of other cardiac or systemic disease capable of producing the observed abnormal LV wall thickness. Systemic diseases that can mimic HCM are for example pressure overload due to long-standing hypertension or aortic stenosis, or storage/infiltrative disorders (Fabry disease, Pompe disease) or certain syndromes (Noonan spectrum diseases, Danon disease). The clinical manifestations of HCM range from asymptomatic LVH to progressive heart failure to ventricular arrhythmias and sudden cardiac death (SCD). Atrial fibrillation and atrioventricular conduction abnormalities can also manifest. HCM is the most common cause of sudden cardiac death under age of 30 and also the most common cause for SCD in athletes. SCD can be the first clinical manifestation even in patients with no clear LVH. Symptoms can vary from individual to individual even within the same family. Common symptoms include shortness of breath (particularly during exercise), chest pain, palpitations, orthostasis, presyncope, and syncope. Most often the LVH of HCM becomes apparent during adolescence or young adulthood, although it may also develop later in life, in infancy, or in childhood.
Genes in the Hypertrophic Cardiomyopathy (HCM) Panel and their clinical significance
|ABCC9||Atrial fibrillation, Cantu syndrome, Dilated cardiomyopathy (DCM)||AD||25||40|
|ACAD9||Acyl-CoA dehydrogenase family, deficiency||AR||25||44|
|ACADVL||Acyl-CoA dehydrogenase, very long chain, deficiency||AR||94||270|
|ACTC1||Left ventricular noncompaction, Hypertrophic cardiomyopathy (HCM), Cardiomyopathy, restrictive, Atrial septal defect, Dilated cardiomyopathy (DCM)||AD||23||60|
|ACTN2||Hypertrophic cardiomyopathy (HCM), Dilated cardiomyopathy (DCM)||AD||10||41|
|AGK*||Sengers syndrome, Cataract 38||AR||18||27|
|AGL||Glycogen storage disease||AR||90||243|
|APOA1||Amyloidosis, systemic nonneuronopathic, Hypoalphalipoproteinemia||AD/AR||27||69|
|BAG3||Dilated cardiomyopathy (DCM), Myopathy, myofibrillar||AD||36||60|
|BRAF*||LEOPARD syndrome, Noonan syndrome, Cardiofaciocutaneous syndrome||AD||135||65|
|CBL||Noonan syndrome-like disorder with or without juvenile myelomonocytic leukemia||AD||23||38|
|COX15||Leigh syndrome, Cardioencephalomyopathy, fatal infantile, due to cytochrome c oxidase deficiency||AR||7||5|
|CSRP3||Hypertrophic cardiomyopathy (HCM), Dilated cardiomyopathy (DCM)||AD||5||29|
|ELAC2||Combined oxidative phosphorylation deficiency 17||AR||11||15|
|FHL1*||Myopathy with postural muscle atrophy, Emery-Dreifuss muscular dystrophy, Reducing bod myopathy||XL||22||60|
|GAA||Glycogen storage disease||AR||147||558|
|HRAS||Costello syndrome, Congenital myopathy with excess of muscle spindles||AD||41||29|
|JPH2||Hypertrophic cardiomyopathy (HCM)||AD||3||12|
|MYBPC3||Left ventricular noncompaction, Hypertrophic cardiomyopathy (HCM), Dilated cardiomyopathy (DCM)||AD||460||1022|
|MYH7||Hypertrophic cardiomyopathy (HCM), Myopathy, myosin storage, Myopathy, distal, Dilated cardiomyopathy (DCM)||AD||285||950|
|MYL2||Hypertrophic cardiomyopathy (HCM), Infantile type I muscle fibre disease and cardiomyopathy||AD||20||66|
|MYL3||Hypertrophic cardiomyopathy (HCM)||AD/AR||13||40|
|NDUFAF2||Mitochondrial complex I deficiency, Leigh syndrome||AR||10||8|
|PRKAG2#||Hypertrophic cardiomyopathy (HCM), Wolff-Parkinson-White syndrome, Glycogen storage disease of heart, lethal congenital||AD||17||56|
|RAF1||LEOPARD syndrome, Noonan syndrome, Dilated cardiomyopathy (DCM)||AD||44||48|
|SLC25A4||Progressive external ophthalmoplegia with mitochondrial DNA deletions, Mitochondrial DNA depletion syndrome||AD/AR||12||15|
|TNNI3||Hypertrophic cardiomyopathy (HCM), Cardiomyopathy, restrictive, Dilated cardiomyopathy (DCM)||AD/AR||54||127|
|TNNT2||Left ventricular noncompaction, Hypertrophic cardiomyopathy (HCM), Cardiomyopathy, restrictive, Dilated cardiomyopathy (DCM)||AD||57||140|
|TPM1||Hypertrophic cardiomyopathy (HCM), Dilated cardiomyopathy (DCM)||AD||33||95|
|TTR||Dystransthyretinemic hyperthyroxinemia, Amyloidosis, hereditary, transthyretin-related||AD||49||146|
* Some, or all, of the gene is duplicated in the genome. Read more.
# The gene has suboptimal coverage (means <90% of the gene’s target nucleotides are covered at >20x with mapping quality score (MQ>20) reads).
The sensitivity to detect variants may be limited in genes marked with an asterisk (*) or number sign (#)
Gene refers to the HGNC approved gene symbol; Inheritance refers to inheritance patterns such as autosomal dominant (AD), autosomal recessive (AR), X-linked (XL), X-linked dominant (XLD) and X-linked recessive (XLR); ClinVar refers to the number of variants in the gene classified as pathogenic or likely pathogenic in this database (ClinVar); HGMD refers to the number of variants with possible disease association in the gene listed in Human Gene Mutation Database (HGMD). The list of associated, gene specific phenotypes are generated from CGD or Orphanet databases.
Non-coding variants covered by the panel
|Gene||Genomic location HG19||HGVS||RefSeq||RS-number|
Test strengthThe strengths of this test include:
- CAP and ISO-15189 accreditations covering all operations at Blueprint Genetics including all Whole Exome Sequencing, NGS panels and confirmatory testing
- CLIA-certified personnel performing clinical testing in a CLIA-certified laboratory
- Powerful sequencing technologies, advanced target enrichment methods and precision bioinformatics pipelines ensure superior analytical performance
- Careful construction of clinically effective and scientifically justified gene panels
- Our Nucleus online portal providing transparent and easy access to quality and performance data at the patient level
- Our publically available analytic validation demonstrating complete details of test performance
- ~1,500 non-coding disease causing variants in Blueprint WES assay (please see below ‘Non-coding disease causing variants covered by this panel’)
- Our rigorous variant classification based on modified ACMG variant classification scheme
- Our systematic clinical interpretation workflow using proprietary software enabling accurate and traceable processing of NGS data
- Our comprehensive clinical statements
Test limitationsThis test does not detect the following:
- Complex inversions
- Gene conversions
- Balanced translocations
- Mitochondrial DNA variants
- Repeat expansion disorders unless specifically mentioned
- Non-coding variants deeper than ±20 base pairs from exon-intron boundary unless otherwise indicated (please see above Panel Content / non-coding variants covered by the panel).
This test may not reliably detect the following:
- Low level mosaicism (variant with a minor allele fraction of 14.6% is detected with 90% probability)
- Stretches of mononucleotide repeats
- Indels larger than 50bp
- Single exon deletions or duplications
- Variants within pseudogene regions/duplicated segments
The sensitivity of this test may be reduced if DNA is extracted by a laboratory other than Blueprint Genetics.
For additional information, please refer to the Test performance section and see our Analytic Validation.
The Blueprint Genetics hypertrophic cardiomyopathy (HCM) panel covers classical genes associated with RCM, obstructive HCM, hypertrophic cardiomyopathy (HCM) and cardiomagaly. The genes on the panel have been carefully selected based on scientific literature, mutation databases and our experience.
Our panels are sliced from our high-quality whole exome sequencing data. Please see our sequencing and detection performance table for different types of alterations at the whole exome level (Table).
Assays have been validated for different starting materials including EDTA-blood, isolated DNA (no FFPE), saliva and dry blood spots (filter card) and all provide high-quality results. The diagnostic yield varies substantially depending on the assay used, referring healthcare professional, hospital and country. Blueprint Genetics’ Plus Analysis (Seq+Del/Dup) maximizes the chance to find a molecular genetic diagnosis for your patient although Sequence Analysis or Del/Dup Analysis may be a cost-effective first line test if your patient’s phenotype is suggestive of a specific mutation type.
Performance of Blueprint Genetics Whole Exome Sequencing (WES) assay. All individual panels are sliced from WES data.
|Sensitivity % (TP/(TP+FN)||Specificity %|
|Single nucleotide variants||99.65% (412,456/413,893)||>99.99%|
|Insertions, deletions and indels by sequence analysis|
|1-10 bps||96.94% (17,070/17,608)||>99.99%|
|11-50 bps||99.07% (957/966)||>99.99%|
|Copy number variants (exon level dels/dups)|
|Clinical samples (small CNVs, n=52)|
|1 exon level deletion||92.3% (24/26)||NA|
|2 exons level deletion/duplication||100.0% (11/11)||NA|
|3-7 exons level deletion/duplication||93.3% (14/15)||NA|
|Microdeletion/-duplication sdrs (large CNVs, n=37))|
|Size range (0.1-47 Mb)||100% (37/37)|
|Simulated CNV detection|
|2 exons level deletion/duplication||90.98% (7,357/8,086)||99.96%|
|5 exons level deletion/duplication||98.63% (7,975/8,086)||99.98%|
|The performance presented above reached by WES with the following coverage metrics|
|Mean sequencing depth at exome level||174x|
|Nucleotides with >20x sequencing coverage (%)||99.4%|
The target region for each gene includes coding exons and ±20 base pairs from the exon-intron boundary. In addition, the panel includes non-coding variants if listed above (Non-coding variants covered by the panel). Some regions of the gene(s) may be removed from the panel if specifically mentioned in the ‘Test limitations” section above. The sequencing data generated in our laboratory is analyzed with our proprietary data analysis and annotation pipeline, integrating state-of-the art algorithms and industry-standard software solutions. Incorporation of rigorous quality control steps throughout the workflow of the pipeline ensures the consistency, validity and accuracy of results. Our pipeline is streamlined to maximize sensitivity without sacrificing specificity. We have incorporated a number of reference population databases and mutation databases such as, but not limited, to 1000 Genomes Project, gnomAD, ClinVar and HGMD into our clinical interpretation software to make the process effective and efficient. For missense variants, in silico variant prediction tools such as SIFT, PolyPhen, MutationTaster are used to assist with variant classification. Through our online ordering and statement reporting system, Nucleus, the customer has an access to details of the analysis, including patient specific sequencing metrics, a gene level coverage plot and a list of regions with inadequate coverage if present. This reflects our mission to build fully transparent diagnostics where customers have easy access to crucial details of the analysis process.
We provide customers with the most comprehensive clinical report available on the market. Clinical interpretation requires a fundamental understanding of clinical genetics and genetic principles. At Blueprint Genetics, our PhD molecular geneticists, medical geneticists and clinical consultants prepare the clinical statement together by evaluating the identified variants in the context of the phenotypic information provided in the requisition form. Our goal is to provide clinically meaningful statements that are understandable for all medical professionals regardless of whether they have formal training in genetics.
Variant classification is the corner stone of clinical interpretation and resulting patient management decisions. Our classifications follow the Blueprint Genetics Variant Classification Schemes based on the ACMG guideline 2015. Minor modifications were made to increase reproducibility of the variant classification and improve the clinical validity of the report. Our experience with tens of thousands of clinical cases analyzed at our laboratory allowed us to further develop the industry standard.
The final step in the analysis of sequence variants is confirmation of variants classified as pathogenic or likely pathogenic using bi-directional Sanger sequencing. Variant(s) fulfilling the following criteria are not Sanger confirmed: the variant quality score is above the internal threshold for a true positive call, and visual check-up of the variant at IGV is in-line with the variant call. Reported variants of uncertain significance are confirmed with bi-directional Sanger sequencing only if the quality score is below our internally defined quality score for true positive call. Reported copy number variations with a size <10 exons are confirmed by orthogonal methods such as qPCR if the specific CNV has been seen less than three times at Blueprint Genetics.
Our clinical statement includes tables for sequencing and copy number variants that include basic variant information (genomic coordinates, HGVS nomenclature, zygosity, allele frequencies, in silico predictions, OMIM phenotypes and classification of the variant). In addition, the statement includes detailed descriptions of the variant, gene and phenotype(s) including the role of the specific gene in human disease, the mutation profile, information about the gene’s variation in population cohorts and detailed information about related phenotypes. We also provide links to the references used, congress abstracts and mutation databases to help our customers further evaluate the reported findings if desired. The conclusion summarizes all of the existing information and provides our rationale for the classification of the variant.
Identification of pathogenic or likely pathogenic variants in dominant disorders or their combinations in different alleles in recessive disorders are considered molecular confirmation of the clinical diagnosis. In these cases, family member testing can be used for risk stratification within the family. In the case of variants of uncertain significance (VUS), we do not recommend family member risk stratification based on the VUS result. Furthermore, in the case of VUS, we do not recommend the use of genetic information in patient management or genetic counseling.
Our interpretation team analyzes millions of variants from thousands of individuals with rare diseases. Thus, our database, and our understanding of variants and related phenotypes, is growing by leaps and bounds. Our laboratory is therefore well positioned to re-classify previously reported variants as new information becomes available. If a variant previously reported by Blueprint Genetics is re-classified, our laboratory will issue a follow-up statement to the original ordering health care provider at no additional cost.
Ackerman, M.J. et al. HRS/EHRA expert consensus statement on the state of genetic testing for the channelopathies and cardiomyopathies: this document was developed as a partnership between the Heart Rhythm Society (HRS) and the European Heart Rhythm Association (EHRA). Europace 2011, 13(8) , 1077–1109.
Charron, P. et al. Genetic counselling and testing in cardiomyopathies: a position statement of the European Society of Cardiology Working Group on Myocardial and Pericardial Diseases. Eur Heart J 2010, (22), 2715–2726.
Gersh, B.J. et al., 2011. 2011 ACCF/AHA guideline for the diagnosis and treatment of hypertrophic cardiomyopathy: executive summary: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. Circulation, 124(24), pp.2761–2796.
Gollob, M.H. et al., 2011. Recommendations for the use of genetic testing in the clinical evaluation of inherited cardiac arrhythmias associated with sudden cardiac death: Canadian Cardiovascular Society/Canadian Heart Rhythm Society joint position paper. Can J Card, 27(2), pp.232–245.
Maron, B.J. et al. Contemporary Definitions and Classification of the Cardiomyopathies: An American Heart Association Scientific Statement From the Council on Clinical Cardiology, Heart Failure and Transplantation Committee; Quality of Care and Outcomes Research and Functional Genomics and Translational Biology Interdisciplinary Working Groups; and Council on Epidemiology and Prevention. Circulation 2006, 113(14), 1807–1816.
Richards S et al. Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology. Genet Med 2015 Mar 5, in press.